यदि \(A=\{1,2,3,4,5\}\) है तो (A) के कितने उपसमुच्चय (2) और (5) दोनों को रखते हैं?
If \(A=\{1,2,3,4,5\}\) then how many subsets of (A) contain both (2) and (5)?
Explanation opens after your attempt
Correct Answer
C. (8)
Concept
The elements (2) and (5) are fixed and the remaining (3) elements are free, so \(2^3=8\). In exams fix compulsory elements first.
Why this answer is correct
The correct answer is C. (8). The elements (2) and (5) are fixed and the remaining (3) elements are free, so \(2^3=8\). In exams fix compulsory elements first.
Exam Tip
(2) और (5) निश्चित हैं और बाकी (3) तत्व स्वतंत्र हैं इसलिए \(2^3=8\)। परीक्षा में अनिवार्य तत्वों को पहले निश्चित करें।
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